Eh, "a few years" here is selling Linux a bit short. I switched about 15 years ago, and while driver issues were a thing, it was still a pretty solid experience. I had to fiddle with my sound card and I replaced my wifi card in my laptop, but other than that, everything else worked perfectly. That still occasionally happens today, but as of about 10 years ago, I honestly haven't heard of many problems (esp. w/ sound, that seems largely solved, at least within a few months of HW release).

I don't know what you're talking about WRT GPUs. Bumblebee (graphics switch) was absolutely a thing back in the day for Nvidia GPUs on laptops, which kinda sucked but did work, and today there are better options. On desktops, I ran Nvidia because ATI's drivers were more annoying at the time. Ubuntu would detect your hardware and ask you to install proprietary drivers for whichever card you had. I ended up getting a laptop w/o a dGPU, mostly because I didn't want to deal with graphics switching, but that doesn't mean it didn't work, it was just a pain. For dedicated systems though, it was pretty simple, I was able to play Minecraft on the GPU that came with my motherboard (ATI?), and it ran the beta Minecraft build just fine, along with some other simple games.

In short, if you were on a desktop, pretty much everything would work just fine. If you were on a laptop, most things would work just fine, and the better your hardware, the fewer problems you'd have (i.e. my ThinkPad worked just fine ~10 years ago).

Playing games could be a bit more tricky, but for just using the machine, pretty much any hardware would work out of the box, even 15 years ago. It has only gotten better since then.